Method for calculating coverage range of line-of-sight link of flight of UAV (unmanned aerial vehicle)

Abstract

The invention relates to a method for detecting a coverage range of a line-of-sight link during flight path planning of an UAV (unmanned aerial vehicle) before a flight test, and belongs to the technical field of flight tests. According to the method, three-dimensional topographic data is used as a basis, and an action range of the line-of-sight link in the case of terrain masking can be generatedby setting of parameters such as geographic location information of a line-of-sight link station, a radio unshielded distance, and flight height to be inspected. The method combines three-dimensionalterrain with the UAV and a radio transmission path, and completes the calculation and inspection of the radio coverage range of the line-of-sight link of the flight of the UAV, and solves the problemthat the action range of the line-of-sight link cannot be accurately estimated when the UAV flies in complex terrain environment. The method is applicable to the flight path planning check during theflight of the UAV (unmanned aerial vehicle). The method can also be used to calculate an action range of a ground-to-air radar, and is suitable for evaluation of station distribution site selection of radar base stations.

Description

technical field [0001] The invention belongs to the field of flight test technology, in particular to link planning in the flight test planning of unmanned aerial vehicle under complex terrain environment. Background technique [0002] The flight of UAV is mainly based on autonomous control flight, and the pilot monitors the UAV and transmits mission data remotely through the line-of-sight link or satellite link on the ground. Due to its large bandwidth and fast transmission rate, the line-of-sight link is usually used for short-distance flight and large-capacity reconnaissance data transmission. But it also has obvious disadvantages. First, the transmission distance is limited due to the curvature of the earth and its own power. Second, it is necessary to ensure that there is no obvious occlusion between the ground link antenna and the UAV, otherwise the signal will be interrupted. At present, the surrounding terrain of most airports in China is relatively flat. When the f...

AI Technical Summary

Problems solved by technology

Even if a person stands next to the antenna and uses an optical angle measuring instrument or visually observes the surrounding environment, he can roughly evaluate the elevation angle and azimuth corresponding to the terrain boundary, but he cannot estimate the elevation angle, azimuth, flight height, and flight distance of the terrain occlusion boundary. relationship, which cannot be used to guide link planning in UAV flight path planning

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